Every .dk domain that delegates its _acme-challenge name to 649c6c90-ce5e-4887-a7ca-6c7ac8467990.stackpath-tls.com. Such CNAMEs hand DNS-01 certificate validation to a shared service, so this list shows who issues TLS certificates through it. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.